Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof

Abstract

The invention discloses anti-oxidation and anti-thermal fatigue hot working die steel which is characterized by including, by mass percent, 0.02 to 0.15 of carbon, 0 to 1.2 of silicon, 0 to 0.6 of manganese, 0 to 0.030 of phosphorus, 0 to 0.015 of sulfur, 8.0 to 12.0 of chromium, 0.2 to 0.6 of molybdenum, 1.5 to 2.3 of tungsten, 0.8 to 1.2 of vanadium, 0.01 to 0.1 of nitrogen, 0.05 to 0.20 of niobium, 1.0 to 4.0 of cobalt, 0.005 to 0.015 of boron, and the balance iron and inevitable impurities. The manufacturing method includes subjecting raw material compositions forming elements to smelting and casting to obtain die steel ingots; forging or rolling the die steel ingots; annealing the forged or rolled die steel ingots; and subjecting the annealed die steel ingots to final thermal treatment. The manufacturing method is characterized in that the annealing process includes that air cooling is kept at a temperature of 800 DEG C to 850 DEG C for 1-2h; and the final thermal treatment process includes that oil cooling is kept at a temperature of 1030 DEG C to 1150 DEG C for 0.5-2h, and air cooling is kept at a temperature of 600 DEG C to 700 DEG C for 1-2h. Compared with the prior art, the anti-oxidation and anti-thermal fatigue hot working die steel and the manufacturing method thereof have the advantages that the hot working die steel manufactured at a temperature above 600 DEG C has a high high-temperature strength and a stagnation temperature compared with the existing hot working die steel such H13 steel and 3Cr2W8V steel, accordingly, high anti-oxidation and anti-thermal fatigue performances are provided, and anticorrosion and anti-oxidation performances are improved greatly compared with the existing hot working die steel because many chromium elements are contained.

Description

Technical field [0001] The invention relates to an alloy steel and a manufacturing method thereof, in particular to an oxidation-resistant and thermal fatigue resistant hot working die steel and a manufacturing method thereof, and belongs to the technical field of metal materials. Background technique [0002] Hot work die steel works in a high temperature and complex environment and bears great impact. After the cavity and the high temperature metal contact, the local temperature reaches 500-800 ℃. It also undergoes repeated heating and cooling, requiring high high temperature strength and Anti-oxidation and thermal fatigue resistance. At present, commonly used hot work die steel materials include 3Cr2W8V and 4Cr5MoSiV (H13 steel). When using these mold steel materials to manufacture hot forging dies, die-casting dies and hot extrusion dies, due to low high temperature strength, poor oxidation resistance and thermal fatigue resistance, oxidation and deformation occur during use...

AI Technical Summary

Problems solved by technology

When using these die steel materials to manufacture hot forging dies, die-casting dies and hot extrusion dies, due to low high-temperature strength, poor oxidation resistance and thermal fatigue resistance, oxidation and deformation occur during use, and heat appears on the inner surface of the cavity. Fatigue cracks (cracks), not only reduce the service life of the mold, but also reduce the surface quality of the formed part

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